REMOVE BEFORE FLIGHT... it's used on airplanes for example on things like Pitot Covers, in order to remind the pilot to take them off before flight or they won't have an airspeed reading once they are airborne. It's a nice thing to print with NinjaFlex or similar.

I uploaded 3 files:

1- 1mm thickness 2- 2mm in thickness (BTW if you flip the file upside down in the printing program you will have a smooth surface on the side where you can read "Remove Before Flight".)

3- Double sided 2mm thickness. (To print the 3rd file ,the double sided one, I suggest you use a multiple of .75mm as that's the depth dimension of the writing. I used .25mm but you can use .15 or .05) https://youtu.be/HkazwbM1BIc

I will try to make a double colored one for the people who has a double extruder, but I need to look into it.

Enjoy!